Climber Alex Puccio

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If her little sister hadn't started climbing around the same time she did, Alex Puccio might never have become the rock star she is today. "She was nine," says Puccio. "I couldn't have my little sister beat me. It drove me."

That competitive side paid off: at 16, she won the first professional competition she entered, the 2006 American Bouldering Series Open National Championships. Since then, Puccio has cemented her place as one of the strongest female climbers on the scene, notching seven V12's and winning a string of ABS titles and a World Cup.